Granted Patent
Utility
US 4,859,983 · App. 07/208,865
Plastic barricade
Inventors:
Jack H. Kulp, Carl L. Erwin
Patented Case
View Patent ↗
Granted: Aug 22, 1989
Filed: Jun 15, 1988
Inventors
Jack H. Kulp
Carl L. Erwin
Assignee (at issue)
Signal, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.